Cyanotypes
Cyanotypes is a term used to describe and catalogue material of this kind, established as a heading by Library of Congress. It sits within the wider heading of Photographs.
Overview
What the sources state
• Placed within: Photographs (Library of Congress Subject Headings: Cyanotypes (sh2021005693))
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
Library record · Institutional or primary · Library of Congress
Library of Congress Subject Headings: Cyanotypes (sh2021005693)
Consult the source